Digital Signal Processing Reference
In-Depth Information
0.6
Active Line
0.5
0.4
0.3
0.2
0.1
0.0
−
0.1
Victim Line
(no skew)
Victim Line
−
0.2
(
+
25 ps skew)
−
0.3
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
Time (ns)
(c)
600
500
400
Crosstalk
+
25 ps skew
300
200
Crosstalk
no skew
No crosstalk
100
0
−
100
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Time (ns)
(d)
Figure 13-29
(
Continued
)
we saw on the quiet line (line 2), when driven by line 1 in our example will
also show up on line 1 if driven by line 2. As a result, we can use the crosstalk
response on line 2 when driven by line 1 to determine the impact of crosstalk on
line 1.
The relative sample point
t
i
allows us to find the worst-case data eye, including
crosstalk in the presence of skew on the data signal transmitter outputs. For
example, Figure 13-29c shows the pulse response and resulting data eye under
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